/* oop.css - V10 FINAL REPAIR */
:root {
    --neon-green: #39ff14;
    --neon-red: #ff3333;
    --bg-color: #050505;
    --panel-bg: #0a0a0a;
    --text-main: #e0e0e0;
    --font-head: 'Orbitron', 'Courier New', sans-serif;
    --font-code: 'Courier Prime', 'Courier New', monospace;
}

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&family=Courier+Prime&display=swap');

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-code);
    margin: 0;
    padding-bottom: 100px;
    overflow-x: hidden;
    font-size: 16px;
}

/* --- MATRIX CANVAS CONTAINER --- */
.matrix-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.15;
    pointer-events: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 10;
}

/* --- HEADER --- */
header {
    text-align: center;
    padding: 40px 0;
    margin-bottom: 30px;
}

h1.glitch {
    font-family: var(--font-head);
    font-size: 3rem;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin: 0;
    text-shadow: 0 0 10px var(--neon-green);
}

.subtitle {
    font-family: var(--font-code);
    color: var(--neon-green);
    font-size: 1.1rem;
    background: #000;
    border: 1px solid var(--neon-green);
    display: inline-block;
    padding: 5px 15px;
    margin-top: 10px;
}

/* --- TABS --- */
.tabs {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.tab-btn {
    background: #000;
    border: 1px solid #444;
    color: #888;
    padding: 12px 25px;
    font-family: var(--font-head);
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.2s;
    min-width: 150px;
}

.tab-btn:hover,
.tab-btn.active {
    border-color: var(--neon-green);
    color: var(--neon-green);
    background: rgba(57, 255, 20, 0.05);
    box-shadow: 0 0 10px rgba(57, 255, 20, 0.2);
}

#open-exam-btn {
    border-color: var(--neon-red);
    color: var(--neon-red);
}

#open-exam-btn:hover {
    background: rgba(255, 51, 51, 0.1);
    box-shadow: 0 0 15px rgba(255, 51, 51, 0.3);
}

.legendary-btn {
    border-color: gold !important;
    color: gold !important;
}

/* --- MODULE LOGIC (CRITICAL FOR HIDING) --- */
.module-section {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.module-section.active {
    display: block !important;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- FLASHCARDS --- */
.flashcard-container {
    width: 100%;
    max-width: 600px;
    height: 300px;
    margin: 0 auto 30px auto;
    perspective: 1000px;
}

.flashcard {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: #000;
    border: 2px solid var(--neon-green);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.card-front h3 {
    font-size: 2.5rem;
    color: #fff;
    font-family: var(--font-head);
    margin: 0;
}

.card-back {
    transform: rotateY(180deg);
    border-color: var(--neon-green);
}

.card-back p {
    font-size: 1.2rem;
    line-height: 1.5;
}

.flashcard-controls {
    text-align: center;
    margin-top: 20px;
}

.control-btn {
    background: #111;
    border: 1px solid #444;
    color: #fff;
    padding: 10px 20px;
    margin: 0 5px;
    cursor: pointer;
}

.control-btn:hover {
    border-color: var(--neon-green);
    color: var(--neon-green);
}

/* --- PRACTICE & CARDS --- */
.practice-card,
.cheat-card {
    background: #080808;
    border: 1px solid #333;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid var(--neon-green);
}

.practice-card p {
    font-size: 1.1rem;
    line-height: 1.5;
    margin-bottom: 15px;
}

/* Buttons in Practice Mode */
.practice-btn {
    display: block;
    width: 100%;
    text-align: left;
    background: #111;
    border: 1px solid #333;
    padding: 12px;
    margin-bottom: 8px;
    color: #aaa;
    cursor: pointer;
    font-family: var(--font-code);
    transition: 0.2s;
}

.practice-btn:hover:not([disabled]) {
    border-color: #fff;
    color: #fff;
    background: #222;
}

/* --- EXAM MODE --- */
#exam-ui {
    border: 2px solid var(--neon-red);
    padding: 20px;
    background: rgba(10, 0, 0, 0.8);
    margin-top: 20px;
    display: none;
    /* Initially hidden */
}

.exam-question-card .q-text {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.option-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 15px;
    margin-bottom: 10px;
    background: #0b0b0b;
    border: 1px solid #333;
    color: #ccc;
    cursor: pointer;
    font-family: var(--font-code);
    font-size: 1rem;
}

.option-btn:hover {
    border-color: var(--neon-red);
    color: #fff;
}

.option-btn.selected {
    background: rgba(255, 51, 51, 0.2);
    border-color: var(--neon-red);
    color: #fff;
}

/* --- CODE BLOCKS --- */
.code-block {
    background: #000;
    border: 1px solid #333;
    padding: 15px;
    font-family: 'Courier Prime', monospace;
    font-size: 1rem;
    overflow-x: auto;
    color: var(--neon-green);
    margin: 10px 0;
    white-space: pre-wrap;
    /* CRITICAL FIX */
    line-height: 1.5;
}

/* --- UTILS --- */
.hidden {
    display: none !important;
}

.cyber-btn {
    background: var(--neon-green);
    color: #000;
    border: none;
    padding: 10px 20px;
    font-weight: bold;
    cursor: pointer;
    font-family: var(--font-head);
    font-size: 1rem;
}

.cyber-btn:hover {
    opacity: 0.9;
}

/* MODALS */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 9000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: #111;
    border: 1px solid var(--neon-green);
    padding: 30px;
    width: 90%;
    max-width: 450px;
    text-align: center;
}

.avatar-grid {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.avatar-option {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 2px solid #333;
    padding: 2px;
    cursor: pointer;
    transition: all 0.2s;
}

.avatar-option img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-option:hover,
.avatar-option.selected {
    border-color: var(--neon-green);
    box-shadow: 0 0 10px var(--neon-green);
    transform: scale(1.1);
}

.cyber-input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    background: #000;
    border: 1px solid #333;
    color: #fff;
    text-align: center;
}

/* Leaderboard */
.leaderboard-table {
    width: 100%;
    margin-top: 20px;
    border-collapse: collapse;
}

.leaderboard-table th {
    text-align: left;
    border-bottom: 2px solid #333;
    padding: 10px;
    color: #888;
}

.leaderboard-table td {
    border-bottom: 1px solid #222;
    padding: 12px 10px;
}